ot: I have Postfix running mail server for several small domains, all working well.
since about 48 hours, several of my domains started getting bounced from hotmail as per below checked with mxtoolbox, mail server is: Checking emu.sbt.net.au which resolves to 103.15.178.123 against 100 known blacklists... Listed 0 times with 3 timeouts has hotmail changed or enforced something new in the last few days ? is there something I should do on my Postfix ? dns ? yesterday, I've added dns record as below, is that a must have ? TXT sbt.net.au 60 min v=spf1 a mx ~all -------------- Feb 5 07:06:45 emu postfix/smtp[32527]: EF7CC24E008: to=<tt...@outlook.com>, relay=mx3.hotmail.com[65.55.37.88]:25, delay=2.4, delays=0.49/0.04/1.6/0.19, dsn=5.0.0, status=bounced (host mx3.hotmail.com[65.55.37.88] said: 550 SC-001 (COL004-MC2F25) Unfortunately, messages from 103.15.178.123 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. (in reply to MAIL FROM command)) Feb 5 07:06:45 emu postfix/smtp[32527]: EF7CC24E008: lost connection with mx3.hotmail.com[65.55.37.88] while sending RCPT TO
